Tools for Development and Debugging in Python

DISQUS
Tools and Stu

David Cramer
twitter.com/zeeg

Friday, July 15, 2011

django-debug-toolbar


$ pip install django-debug-toolbar

# settings.py
INSTALLED_APPS = (
'debug_toolbar',
)

MIDDLEWARE_CLASSES = (
'debug_toolbar.middleware.DebugToolbarMiddleware',
)

INTERNAL_IPS = ('127.0.0.1',)


Extending the Toolbar

class SettingsVarsDebugPanel(DebugPanel):
"""
A panel to display all variables in django.conf.settings
"""
name = 'SettingsVars'
has_content = True

def nav_title(self):
return _('Settings')

def title(self):
return _('Settings')

def content(self):
context = self.context.copy()
context.update({
'settings': get_safe_settings(),
})
return as_string('debug_toolbar/panels/settings.html', context)



DEBUG_TOOLBAR_PANELS = (
'debug_toolbar.panels.version.VersionDebugPanel',
'debug_toolbar.panels.timer.TimerDebugPanel',
'debug_toolbar.panels.settings_vars.SettingsVarsDebugPanel',
'debug_toolbar.panels.headers.HeaderDebugPanel',
'debug_toolbar.panels.request_vars.RequestVarsDebugPanel',
'debug_toolbar.panels.template.TemplateDebugPanel',
'debug_toolbar.panels.sql.SQLDebugPanel',
'debug_toolbar.panels.signals.SignalDebugPanel',
'debug_toolbar.panels.logger.LoggingPanel',
)


Werkzeug
w/ django-devserver


$ pip install django-devserver

# settings.py
INSTALLED_APPS = (
'devserver',
)

$ python manage.py runserver


• SQL Queries (Realtime and Summarized)
• Proﬁling (Execution time, Memory Usage)
• Cache usage summary
• Ajax requests
• Session information
• Write your own!


class AjaxDumpModule(DevServerModule):
"""
Dumps the content of all AJAX responses.
"""

logger_name = 'ajax'

def process_response(self, request, response):
if request.is_ajax():
self.logger.info(response.content)



DEVSERVER_MODULES = (
'devserver.modules.sql.SQLSummaryModule',
'devserver.modules.ajax.AjaxDumpModule’,
'devserver.modules.profile.ProfileSummaryModule',
'devserver.modules.request.SessionInfoModule',
'devserver.modules.profile.MemoryUseModule',
'devserver.modules.profile.LeftOversModule',
'devserver.modules.cache.CacheSummaryModule',
)


Sentry


$ pip install django-sentry

# settings.py
INSTALLED_APPS = (
'sentry',
'sentry.client',
)


# settings.py
MIDDLEWARE_CLASSES = (
'sentry.client.middleware.SentryResponseErrorIdMiddleware',
)

# 500.html
Sorry friends, something’s not working.

{% if request.sentry.id %}
If you need assistance, you may reference this error
as {{ request.sentry.id }}.
{% endif %}

• Builtin support for Celery
• Server/Client (clients can be any language)
• 2.x powered by Flask/Redis (no Django)


Gargoyle


$ pip install gargoyle

# settings.py
INSTALLED_APPS = (
'gargoyle',
)


from gargoyle import gargoyle

def my_view(request):
if gargoyle.is_active('awesome', request):
return 'new happy version :D'
else:
return 'old sad version :('


class HostConditionSet(ConditionSet):
hostname = String()

def can_execute(self, instance):
return instance is None

def get_field_value(self, instance, field_name):
if field_name == 'hostname':
return socket.gethostname()

gargoyle.register(HostConditionSet())


Wrap Up


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Questions?

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References

• Debug Toolbar
https://github.com/django-debug-toolbar/django-debug-toolbar
• Devserver
https://github.com/dcramer/django-devserver
• Werkzeug
https://github.com/mitsuhiko/werkzeug
• Gargoyle
https://github.com/disqus/gargoyle
• Sentry
https://github.com/dcramer/django-sentry (1.x)
https://github.com/dcramer/sentry (2.x)

code.disqus.com


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